Shure Incorporated BETA Series Headworn Vocal Microphone BETA 54

The Shure BETA 54 is a subminiature, electret condenser headworn microphone. It provides uncompromised sound quality and reliability with minimal visibility in applications such as broadcast, theater, and touring. Despite the small size, the condenser element delivers full, clear, and natural reproduction of speech and vocals.
The microphone features a durable, low-profile wire frame headband which is fully adjustable for stability and comfort. A plastic carrying case protects the microphone and its accessories.
Type
Condenser (electret bias)
Frequency Response
50Hz to 20KHz
Polar Pattern
Supercardioid
Output Noise (equivalent dBSPL, A-weighted)
39.0 dB typical; 42.0 dB maximum
Signal-to-Noise Ratio
55.0 dB at 94 dB SPL
Recommended Minimum Input Impedance
>1 kilohm
Preamp Output Impedance
136 ohms
Output Level, open circuit, ref. 1v/Pa at 1 kHz
-52.0 +/- 3.0dB 2.51mV
Maximum Sound Pressure Level
149 dBSPL at 1% THD/1 kilohm load
Dynamic Range
110 dB (max. SPL with 1k load, minus typical A-wt. noise)
Current Drain
4.6 mA (preamp and microphone)
Output Polarity
Positive pressure on the diaphragm produces a positive voltage at:
Pin 2 relative to pin 3 at the output connector of the preamp
Power Requirements
Phantom power; 11 to 52 Vdc positive on pins 2 and 3, return on pin 1 (ground)
Cable
1.5 m (5 ft.), small-diameter, shielded, with mini 4-pin connector (TA4F)